i'm going to try to get a number out of my cutter tomorrow. if i can't, i'm going to price the product on geekhackers.org, put it up and you will be able to start ordering by tomorrow EOD. if i do manage to talk to him and it comes up high (worst case), then i might have to do a bit of thinking on how to lower costs. i suspect i will be able to talk to him and he'll give me a quote in the ballpark i've been predicting, in which case, you will be able to start ordering as soon as i price the product, give it a description and some pictures and get it up on geekhackers.org
re: LEDs. no, the current PCB does not support LEDs. that does not rule out the possibility of a board with the same layout and form factor with LEDs in the future, however.
as for parts you will need, expect to buy switches, diodes, potentially a small number of resistors and a mini usb female jack, stabilizers, and keycaps that fit the layout. we will make a bill of materials available that will allow you to purchase almost all of these parts from either newark, digikey or mouser in a few clicks.
note above that i have not priced the stabilizers into the kit. i may be able to sell these separately, but i will have to look into it. in the meantime, they are available from several popular geekhack retailers. for, as far as i know, pretty reasonable prices.
i have also not priced the teensy into the kit. i will be selling the teensy separately, as there are a bunch of teensies running around due to jdcarpe's recent buy, and i don't want to make people buy an extra teensy. i will also provide a small piece of hookup wire with the pcb that can be used to connect the USB data line to the teensy.
i will NOT be providing construction services, only kits. we WILL write up instructions on constructing the keyboard, with pictures, maybe some video, etc.